User blog comment:Dark1amethyst/Randomizer Nuzlocke: Cheshma Town/@comment-33269376-20180314092412/@comment-31267872-20180314205837

If it faints, you can't catch another Pokémon in the area, at least I think so. Pokémon outside of the Roria Safari Zone can't flee. I assume you won't be able to catch another if the first flees. The Shiny case is pretty much up to Dark1amethyst.